The first requirement states that AS 100 cannot be transit for AS 54 to reach AS 200 and vice versa without using access-list, prefix-list, and filter-list. So immediately I thought of setting "no-export" community for route coming from AS 54 and AS 200. But that will also stop routes originated from other AS traversing AS 54 and AS 200. So I sat there for an hour trying not to look at the solution guide. Finally I gave up. The solution guide uses "no-export" community which I think does not meet the requirement. Is this one of those case I should ask the proctor in the real lab?
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